Duplex mud pump



FIG. 1 is a front perspective view of a duplex mud pump showing my new design;

FIG. 2 is a front elevational view thereof, with certain parts omitted for ease of illustration;

FIG. 3 is a rear perspective thereof;

FIG. 4 is a bottom plan view thereof with certain parts omitted for ease of illustration; and

FIG. 5 is a right side elevational view thereof with certain parts omitted for ease of illustration. 

The ornamental design for a duplex mud pump, as shown. 